Darryl Peterson provides a brief introduction to the hole-drilling method of determining residual stress. These stresses can be beneficial or detrimental to the survivability of a part subjected to service loads, and can be inadvertently caused by machining, welding, and assembly processes, or intentionly developed using techniques like shotpeening. Darryl also gives a thorough description of each critical component that makes up the RS-200 milling guide, the device used for introducing the required precison hole into the test specimen. Details for this technique can be found in the ASTM standard, E 837.